APPLIED SURFACE SCIENCE
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2024
·
IF 6.3
Juan Qiu,Xiang Gao,Guiqiu Li,Kanglu Feng,Kangwei Gongsun,Chunchao Chen,Changming Bu,Houyi Ma
An approach to fabricate protective film on copper substrate utilizing molybdate or tungstate assisted by dithiol was proposed. The fabricated films exhibited double-layer structure. The top layer was an organic layer primarily composed of interconnected dithiol molecules through disulfide bonds originating from the oxidation of molybdate or tungstate. The Cu 2 S bottom-layer formed as a result of the cleavage of C-S bonds subsequent to the adsorption of dithiol molecules onto the copper matrix. The molybdate participated the film via MoO x and MoS x . Although no tungstate species were detected in the film, the oxidizing effect of tungstate facilitated a conversion of dithiol molecules into polymers, resulting in a significantly thicker surface layer. The corrosion protection efficiencies of the films reached 99.7 % and 99.8 %, respectively, attributed to the incorporation of molybdate or tungstate additives. Theoretical calculations provided valuable insights into the process of film formation and elucidated the relationship between film structure and anti-corrosion performance.
研究领域:
材料科学
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电化学
·
表面工程
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产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Wansong Chen,Mang Niu,Zhaozuo Zhang,Lin Chen,Xing Li,Jinming Zhang,Ruoxin Sun,Haijie Cao,Xiaoxia Wang
Electrochemical hydrogen evolution reaction (HER) from water splitting driven by renewable energy is considered a promising method for large-scale hydrogen production, and as an alternative to noble-metal electrocatalysts, molybdenum carbide (Mo 2 C) has exhibited effective HER performance. However, the strong bonding strength of intermediate adsorbed H ( H ads ) with Mo active site slows down the HER kinetics of Mo 2 C. Herein, using phase-transition strategy, hexagonal β-Mo 2 C could be easily transferred to cubic δ-Mo 2 C through electron injection triggered by tungsten (W) doping, and heterointerface-rich Mo 2 C-based composites, including β-Mo 2 C, δ-Mo 2 C, and MoO 2 , are presented. Experimental results and density functional theory calculations reveal that W doping mainly contributes to the phase-transition process, and the generated heterointerfaces are the dominant factor in inducing remarkable electron accumulation around Mo active sites, thus weakening the Mo─H coupling. Wherein, the β-Mo 2 C/MoO 2 interface plays an important role in optimizing the electronic structure of Mo 3d orbital and hydrogen adsorption Gibbs free energy (Δ G H* ), enabling these Mo 2 C-based composites to have excellent intrinsic catalytic activity like low overpotential ( η 10 = 99.8 mV), small Tafel slope (60.16 dec −1 ), and good stability in 1 m KOH. This work sheds light on phase-transition engineering and offers a convenient route to construct heterointerfaces for large-scale HER production.
研究领域:
材料科学
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电催化
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理论计算
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yunan Wang,Yingying Sun,Qian Long,Jie Liu,Di Guo,Zhengwang Zhu,Haifeng Zhang
Orthorhombic tungsten oxide (WO 3 ·H 2 O) has been considered as a promising anode material due to its layered crystal structure and high capacity. However, the instability of its crystal structure usually results in poor cyclic stability of the battery/capacitor. Herein, a novel strategy of introducing aluminum ion (Al 3+ ) additives for designing hybrid electrolyte is demonstrated to enhance the cycling stability of WO 3 ·H 2 O. Aluminum ions may participate in the redox reaction and contribute extra capacitance. More importantly, the Al 3+ ions can facilitate fast phase transformation of metastable orthorhombic tungsten oxides to stable monoclinic phase, but also participate in the construction of stable protective layer during the long-term cycling, forming a protective layer at the surface of tungsten oxide for alleviating the dissolution and structural damage. The WO 3 ·H 2 O is electrodeposited on the exfoliated graphite foil (Ex-GF) and shows a specific capacitance of 395 mF cm −2 at 2 mA cm −2 in the LiCl + AlCl 3 hybrid electrolyte (pH = 2.93), and the capacitance remains 91.8 % after 10,000 charge/discharge cycles, indicating that the WO 3 ·H 2 O/Ex-GF electrode material exhibits excellent stability in supercapacitors. The density functional theory (DFT) calculations further demonstrate whether the adsorption energy or intercalation energy of Li + at the monoclinic WO 3 is lower than the orthorhombic WO 3 ·H 2 O. This result suggests that the electrochemical performance of WO 3 ·H 2 O, which operates on a pseudocapacitive reaction mechanism, can be enhanced through the phase transformation from the orthorhombic phase to the monoclinic phase during the cycling. Hence, this ion additive approach can adjust the interface composition and protect internal active material, and can be extended to the stability improvement of other metal oxide electrodes.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
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IF 4.175
Yunfang Huang,Hui Xu,Dan Luo,Yuezhu Zhao,Yu Fang,Qiyao Guo,Yuelin Wei,Leqing Fan,Jihuai Wu
To improve the utilization efficiency of solar energy and separation of photogenerated carries, a novel three-dimensional (3D) WO 3-x /Bi/BiOCl hierarchical heterostructures with broad spectrum responsive photocatalytic activity have been fabricated through a facile solvothermal technique. The influences of varying loading of WO 3-x on the physical performances of the as-obtained composites were systematically characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy , X-ray photoelectron spectroscopy, optical absorbance, photoluminescence and specific surface areas. The WO 3-x /Bi/BiOCl displayed a strong optical absorption from 250 to 2500 nm, and showed the superior photocatalytic performance in degradation of rhodamine B (RhB) than that of individual components. Among the as-prepared samples, the sample S24 with the appropriate content of WO 3-x displayed the best photocatalytic performance, which can photodegrade RhB with the efficiency of 100%, 100% and 96% under the UV light within 8 min, visible light within 3 min and near-infrared light within 120 min exposure, respectively. Furthermore, a plausible mechanism of the RhB degradation on WO 3-x /Bi/BiOCl photocatalysts under the near-infrared light irradiation was proposed according to the photocatalytic activity and radical species trapping experiments.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
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2022
·Vol. 25
·期 5
·2200175
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IF 4.122
Meiqin Zeng,Youtao Pan,Weifeng Liu,Jie Cui,Zhongchen Lu,Min Zhu
This work prepares nanocrystalline tungsten carbide (WC) powder using conventional ball milling or plasma milling (P-milling) to process tungsten trioxide (WO 3 )–carbon (C) mixtures, with subsequent carbothermal reduction. The aim is to assess the effects of a discharge plasma on the microstructure of these materials. The results indicates that WC powders with particle sizes of less than 100 nm could be fabricated through heating at a relatively low temperature of 1150 °C for 1 h under vacuum after P-milling. This process is found to allow a lower processing temperature and provided more complete carburization in comparison with conventional ball milling. P-milling is determined to produce more loosely adhering WO 3 nanoparticles and a higher surface area, resulting in more reactive sites and a larger contact area between WO 3 nanoparticles and C atoms. This technique simultaneously generates more oxygen vacancies and defects on the surfaces of the WO 3 and C, respectively, based on the use of a plasma discharge. It is evident that this new technology permits nanocrystalline WC to be readily obtained from WO 3 and C in a reduced time span and at a lower cost and greater efficiency. This technique could also be used to fabricate WC nanopowders on an industrial scale.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
RSC Advances
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2014
·Vol. 4
·期 32
·16769-16776
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IF 3.708
Mingyuan Zhu,Guangqin Luo,Lihua Kang,Bin Dai
In the study, an HPW–PDMAEMA–SiO2 (phosphotungstic acid (HPW); poly-N,N-dimethylaminoethyl methacrylate (PDMAEAM)) catalyst was successfully synthesized. The synthesized HPW–PDMAEMA–SiO2 catalyst was characterized via XRD, TEM, FT-IR, TGA, and ICP-AES. The results show that the HPW active species retained its Keggin structure after immobilizing into polymer brushes. At optimal reaction conditions, the oxidative desulfurization conversion of dibenzothiophene reached 100%, and there was no significant catalytic performance decrease after six recycles. The excellent recoverability of the catalyst was attributed to the decreased leaching of the HPW active species caused by the strong interaction between the negative [PW12O40]3− ions and positive ammonium ions in the PDMAEMA polymer brushes.
研究领域:
化学工程
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催化材料
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产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2016
·Vol. 23
·期 3
·823-831
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IF 1.385
Yuan Junjie,Xiong Jun,Wang Jiahong,Ding Wenjing,Yang Lei,Zhang Ming,Zhu Wenshuai,Li Huaming
A supported catalyst was synthesized on the mesoporous materials with ionic liquid modified by the silicontungstic acid (HSiW-IL/SBA-15). A series of characterization, such as XRD, N 2 adsorption desorption, SEM, TEM and XPS analysis showed that HSiW was successfully immobilized onto the IL modified SBA-15 and maintained the SBA-15 mesoporous structure. Compared with HSiW and HSiW/SBA-15, the catalyst HSiW-IL/SBA-15 had excellent catalytic activity for oxidative desulfurization of fuels. After analysis, the high activity of HSiW-IL/SBA-15 was attributed to the catalyst with large specific surface area, pore size and hydrophobic performance, which had a better wettability for fuel. The catalyst had a good recycling performance, and the sulfur removal still remained 96.4 % after eight times cycle.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 7
·5242-5251
·
IF 4.6
Qiyuan Zhang,Ruoming Du,Aihua Yao
Recent advances in hydrated tungsten oxides (WO3·nH2O, n = 1, 2) have highlighted their potential for dual-band electrochromic applications. However, achieving both high optical modulation and robust cycling stability remains a challenge. This study presents a cost-effective and straightforward cathodic electrodeposition method to fabricate amorphous tungsten oxide dihydrate (WO3·2H2O) films using a precursor solution primarily composed of monomeric diperoxotungstate. The open framework and interlayer structural water in WO3·2H2O enable exceptional dual-band electrochromic performance at super-low switching potentials (−0.5 V for full coloration and 0.5 V for full bleaching) in a 1.0 M LiClO4/propylene carbonate (LiClO4/PC) electrolyte. Key features include high optical modulation (∼92% at 633 nm and ∼86% at 1100 nm), fast response times (17.5 s for bleaching and 18.1 s for coloration at 633 nm; 5.0 s for bleaching and 7.1 s for coloration at 1100 nm), high coloration efficiencies (204.2 cm2 per C at 1100 nm and 72.3 cm2 per C at 633 nm), and exceptional cycling stability (retaining 94% of initial optical modulation after 2000 cycles and 76% after 10 000 cycles at 633 nm). The interlayer water in WO3·2H2O plays a critical role in facilitating pseudocapacitive Li+ intercalation, enabling control over optical properties across the visible and near-infrared (NIR) regions while maintaining structural integrity. Additionally, the scalability of the method was demonstrated through the successful fabrication of large-area films (10 cm × 10 cm) and prototype electrochromic devices.
研究领域:
材料科学
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电化学
·
光学材料
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产品关联
DOI
PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2013
·Vol. 7
·期 4
·422-427
·
IF 0
Liu Liyan,Zhang Yu,Tan Wei
Phosphotungstic acid/activated carbon (PTA/AC) catalysts with various AC sizes or PTA content have been synthesized and characterized by N 2 physisorption, X-ray diffraction, Fourier transform infrared spectroscopy and temperature programmed desorption of ammonia. These catalysts were then evaluated in terms of the removal of dibenzothiophene (DBT) by ultrasoundassisted oxidative desulfurization process. The results showed that the DBT conversion obviously increased with the decrease of AC support size and the increase of PTA content. After supporting PTA on AC, the DBT conversion can be improved by 38.9% after ultrasound irradiation for 10 min. In addition, the stability tests of PTA/AC showed that the catalytic oxidative activity of PTA/AC was nearly kept constant after ultrasound irradiation for 20 min, which makes it a promising catalyst to use in ultrasound-assisted oxidative desulfurization process.
研究领域:
催化化学
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环境科学
✓ 已验证
DOI
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Man Yang,Yuxiang Jiao,Jianglin Duan,Keying Wu,Hailiang Song,Shaodong Sun,Yujing Ren
Taking the background of the ambiguous role of oxophilic metal oxide in metal-acid bifunctional catalysts for the important field of tetrahydrofurfuryl alcohol (THFA) hydrogenolysis, a linear relationship between the W═O/W–OH content in sub-nano-Rh-supported WOx and 1,5-pentanediol (1,5-PeD) yields from THFA hydrogenolysis has been established. It reveals that the higher reduction temperature promotes the surface Rh/W ratio. Thus, hydrogen spillover is facilitated, leading to more surface W═O structures and thereby more in-situ-reduced W–OH generation. W–OH structures work as the active sites to provide in situ Brønsted acid, resulting in enhanced selective activation for secondary C–O bonds of THFA. This discovery reveals the unique role of the surface structure on oxophilic metal oxide in chemoselective hydrogenolysis of the secondary C–O bond in polyols.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 8
·2250-2256
·
IF 3.186
Liu Qi,Wang Shihao,Xu Gang,Wu Minghong,Chen Jianjun,Li Junhua
Abstract A novel TiO 2 -supported vanadium-substituted tungstophosphoric acid (PW 11 V/TiO 2 ) catalyst was designed and applied for selective catalytic reduction of NO x by NH 3 . Compared with the commercial tungstophosphoric acid (PW 12 /TiO 2 ), PW 11 V/TiO 2 displayed a nearly 90% activity improvement at 300 °C. In addition, the favorable resistance and stability to SO 2 were also obtained over PW 11 V/TiO 2 catalyst. Phase analysis and spectroscopy results indicated the vanadium was successfully incorporated into the molecular structure of PW 12 , and the Keggin framework still keep stable over the TiO 2 support. H 2 -TPR test proved the incorporation of vanadium promoted the redox ability of PW 11 V. The present study provides us an effective way to improve the performance of catalytic removal of NO x through tungstophosphoric acid catalyst. Graphic Abstract
After introduction of V species, the obtained PW 11 V/TiO 2 catalyst show better NH 3 -SCR performance and N 2 selectivity than PW 12 /TiO 2 catalyst.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Xi Senliang,Wang Xiaojun,Wu Dan,Hu Xingtao,Zhou Shixue,Yu Hao
Phosphotungstic acid (HPW) as a polyoxometalate was selected as the active component of the catalyst. The activated carbon supported different percentage of HPW catalysts were prepared by impregnation and were characterized by X-ray diffraction (XRD), nitrogen adsorption, Fourier transform infrared (FTIR), and scanning electron microscope (SEM). The results showed that the HPW retained the original Keggin structure after being supported on activated carbon, the specific surface of the HPW/C was much bigger than that of pure HPW. The catalytic performance of HPW/C in the hydrogen generation reaction by hydrolysis of sodium borohydride in seawater and in deionized water were studied. 2.5 wt.% HPW/C showed the fastest hydrolysis reaction rate and the biggest volume of hydrogen generated. As for hydrolysis of sodium borohydride, catalytic effect of HPW/C was better in seawater than in distilled water. HPW dispersed on activated carbon is a real promising catalytic system for the development of hydrogen generation by hydrolysis of NaBH4 in seawater.
研究领域:
化学
·
材料科学
·
能源科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）